<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ReferencePath.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Function;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Iterables;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.google.common.reflect.TypeToken;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.ArrayDeque;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.ArrayList;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.HashMap;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.Map;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.util.CastFunction;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.slf4j.Logger;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.slf4j.LoggerFactory;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>/**<a name="line.23"></a>
<span class="sourceLineNo">024</span> * Reference paths.<a name="line.24"></a>
<span class="sourceLineNo">025</span> *<a name="line.25"></a>
<span class="sourceLineNo">026</span> * &lt;p&gt;<a name="line.26"></a>
<span class="sourceLineNo">027</span> * A Reference path consists of:<a name="line.27"></a>
<span class="sourceLineNo">028</span> * &lt;ul&gt;<a name="line.28"></a>
<span class="sourceLineNo">029</span> *  &lt;li&gt;A {@linkplain #getStartType starting Java object type},&lt;/li&gt;<a name="line.29"></a>
<span class="sourceLineNo">030</span> *  &lt;li&gt;A final {@linkplain #getTargetType target object type} and {@linkplain #getTargetField target field}<a name="line.30"></a>
<span class="sourceLineNo">031</span> *      within that type, and&lt;/li&gt;<a name="line.31"></a>
<span class="sourceLineNo">032</span> *  &lt;li&gt;An intermediate chain of zero or more {@linkplain #getReferenceFields reference fields} through which an<a name="line.32"></a>
<span class="sourceLineNo">033</span> *      instance of the target type can be reached from an instance of the starting type.&lt;/li&gt;<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;/ul&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span> *<a name="line.35"></a>
<span class="sourceLineNo">036</span> * &lt;p&gt;<a name="line.36"></a>
<span class="sourceLineNo">037</span> * Reference paths can be described by the combination of (a) the starting Java object type, and (b) the path of reference<a name="line.37"></a>
<span class="sourceLineNo">038</span> * fields and final target field in a {@link String} form consisting of field names separated by period ({@code "."}) characters.<a name="line.38"></a>
<span class="sourceLineNo">039</span> * All of the fields except the last must be reference fields.<a name="line.39"></a>
<span class="sourceLineNo">040</span> * &lt;/p&gt;<a name="line.40"></a>
<span class="sourceLineNo">041</span> *<a name="line.41"></a>
<span class="sourceLineNo">042</span> * &lt;p&gt;<a name="line.42"></a>
<span class="sourceLineNo">043</span> * For example, path {@code "parent.age"} starting from object type {@code Person} might refer to the age of<a name="line.43"></a>
<span class="sourceLineNo">044</span> * the parent of a {@code Person}.<a name="line.44"></a>
<span class="sourceLineNo">045</span> * &lt;/p&gt;<a name="line.45"></a>
<span class="sourceLineNo">046</span> *<a name="line.46"></a>
<span class="sourceLineNo">047</span> * &lt;p&gt;<a name="line.47"></a>
<span class="sourceLineNo">048</span> * When a complex field appears in a reference path, both the name of the complex field and the specific sub-field<a name="line.48"></a>
<span class="sourceLineNo">049</span> * being traversed should appear, e.g., {@code "mymap.key.somefield"}. For set and list fields, the (only) sub-field is<a name="line.49"></a>
<span class="sourceLineNo">050</span> * named {@code "element"}, while for map fields the sub-fields are named {@code "key"} and {@code "value"}.<a name="line.50"></a>
<span class="sourceLineNo">051</span> * &lt;/p&gt;<a name="line.51"></a>
<span class="sourceLineNo">052</span> *<a name="line.52"></a>
<span class="sourceLineNo">053</span> * &lt;p&gt;<a name="line.53"></a>
<span class="sourceLineNo">054</span> * &lt;b&gt;Fields of Sub-Types&lt;/b&gt;<a name="line.54"></a>
<span class="sourceLineNo">055</span> * &lt;/p&gt;<a name="line.55"></a>
<span class="sourceLineNo">056</span> *<a name="line.56"></a>
<span class="sourceLineNo">057</span> * &lt;p&gt;<a name="line.57"></a>
<span class="sourceLineNo">058</span> * In some cases, a field may not exist in a Java object type, but it does exist in a some sub-type of that type. For example:<a name="line.58"></a>
<span class="sourceLineNo">059</span> * &lt;/p&gt;<a name="line.59"></a>
<span class="sourceLineNo">060</span> *<a name="line.60"></a>
<span class="sourceLineNo">061</span> * &lt;pre&gt;<a name="line.61"></a>
<span class="sourceLineNo">062</span> * &amp;#64;JSimpleClass(storageId = 10)<a name="line.62"></a>
<span class="sourceLineNo">063</span> * public class Person {<a name="line.63"></a>
<span class="sourceLineNo">064</span> *<a name="line.64"></a>
<span class="sourceLineNo">065</span> *     &amp;#64;JSimpleSetField(storageId = 11)<a name="line.65"></a>
<span class="sourceLineNo">066</span> *     public abstract Set&amp;lt;Person&amp;gt; &lt;b&gt;getFriends&lt;/b&gt;();<a name="line.66"></a>
<span class="sourceLineNo">067</span> *<a name="line.67"></a>
<span class="sourceLineNo">068</span> *     &amp;#64;OnChange("friends.element.&lt;b&gt;name&lt;/b&gt;")<a name="line.68"></a>
<span class="sourceLineNo">069</span> *     private void friendNameChanged(SimpleFieldChange&amp;lt;NamedPerson, String&amp;gt; change) {<a name="line.69"></a>
<span class="sourceLineNo">070</span> *         // ... do whatever<a name="line.70"></a>
<span class="sourceLineNo">071</span> *     }<a name="line.71"></a>
<span class="sourceLineNo">072</span> * }<a name="line.72"></a>
<span class="sourceLineNo">073</span> *<a name="line.73"></a>
<span class="sourceLineNo">074</span> * &amp;#64;JSimpleClass(storageId = 20)<a name="line.74"></a>
<span class="sourceLineNo">075</span> * public class NamedPerson extends Person {<a name="line.75"></a>
<span class="sourceLineNo">076</span> *<a name="line.76"></a>
<span class="sourceLineNo">077</span> *     &amp;#64;JSimpleField(storageId = 21)<a name="line.77"></a>
<span class="sourceLineNo">078</span> *     public abstract String &lt;b&gt;getName&lt;/b&gt;();<a name="line.78"></a>
<span class="sourceLineNo">079</span> *     public abstract void setName(String name);<a name="line.79"></a>
<span class="sourceLineNo">080</span> * }<a name="line.80"></a>
<span class="sourceLineNo">081</span> * &lt;/pre&gt;<a name="line.81"></a>
<span class="sourceLineNo">082</span> * Here the path {@code "friends.element.name"} is technically incorrect because {@code "friends.element"}<a name="line.82"></a>
<span class="sourceLineNo">083</span> * has type {@code Person}, and {@code "name"} is a field of {@code NamedPerson}, not {@code Person}. However, this will<a name="line.83"></a>
<span class="sourceLineNo">084</span> * still work as long as there is no ambiguity, i.e., in this example, there are no other sub-types of {@code Person}<a name="line.84"></a>
<span class="sourceLineNo">085</span> * with a field named {@code "name"}. Note also in the example above the<a name="line.85"></a>
<span class="sourceLineNo">086</span> * {@link org.jsimpledb.change.SimpleFieldChange} parameter to the method<a name="line.86"></a>
<span class="sourceLineNo">087</span> * {@code friendNameChanged()} necessarily has generic type {@code NamedPerson}, not {@code Person}.<a name="line.87"></a>
<span class="sourceLineNo">088</span> *<a name="line.88"></a>
<span class="sourceLineNo">089</span> * &lt;p&gt;<a name="line.89"></a>
<span class="sourceLineNo">090</span> * In cases where multiple sub-types of a common super-type type have fields with the same name but different storage IDs,<a name="line.90"></a>
<span class="sourceLineNo">091</span> * the storage ID may be explicitly specified as a suffix, for example, {@code "name#123"}.<a name="line.91"></a>
<span class="sourceLineNo">092</span> * &lt;/p&gt;<a name="line.92"></a>
<span class="sourceLineNo">093</span> *<a name="line.93"></a>
<span class="sourceLineNo">094</span> * &lt;p&gt;<a name="line.94"></a>
<span class="sourceLineNo">095</span> * Reference paths are created via {@link JSimpleDB#parseReferencePath JSimpleDB.parseReferencePath()}.<a name="line.95"></a>
<span class="sourceLineNo">096</span> * &lt;/p&gt;<a name="line.96"></a>
<span class="sourceLineNo">097</span> *<a name="line.97"></a>
<span class="sourceLineNo">098</span> * @see JSimpleDB#parseReferencePath JSimpleDB.parseReferencePath()<a name="line.98"></a>
<span class="sourceLineNo">099</span> */<a name="line.99"></a>
<span class="sourceLineNo">100</span>public class ReferencePath {<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span>    final Class&lt;?&gt; startType;<a name="line.102"></a>
<span class="sourceLineNo">103</span>    final Class&lt;?&gt; targetType;<a name="line.103"></a>
<span class="sourceLineNo">104</span>    final JFieldInfo targetFieldInfo;<a name="line.104"></a>
<span class="sourceLineNo">105</span>    final JComplexFieldInfo targetSuperFieldInfo;<a name="line.105"></a>
<span class="sourceLineNo">106</span>    final ArrayList&lt;JReferenceFieldInfo&gt; referenceFieldInfos = new ArrayList&lt;&gt;();<a name="line.106"></a>
<span class="sourceLineNo">107</span>    final String path;<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    private final Logger log = LoggerFactory.getLogger(this.getClass());<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span>    /**<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * Constructor.<a name="line.112"></a>
<span class="sourceLineNo">113</span>     *<a name="line.113"></a>
<span class="sourceLineNo">114</span>     * @param jdb {@link JSimpleDB} against which to resolve object and field names<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * @param startType starting Java type for the path<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * @param path dot-separated path of zero or more reference fields, followed by a target field<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * @param lastIsSubField true if the last field can be a complex sub-field but not a complex field, false for the reverse,<a name="line.117"></a>
<span class="sourceLineNo">118</span>     *  or null for don't care<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * @throws IllegalArgumentException if {@code jdb}, {@code startType}, or {@code path} is null<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * @throws IllegalArgumentException if {@code path} is invalid<a name="line.120"></a>
<span class="sourceLineNo">121</span>     */<a name="line.121"></a>
<span class="sourceLineNo">122</span>    ReferencePath(JSimpleDB jdb, Class&lt;?&gt; startType, String path, Boolean lastIsSubField) {<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span>        // Sanity check<a name="line.124"></a>
<span class="sourceLineNo">125</span>        if (jdb == null)<a name="line.125"></a>
<span class="sourceLineNo">126</span>            throw new IllegalArgumentException("null jdb");<a name="line.126"></a>
<span class="sourceLineNo">127</span>        if (startType == null)<a name="line.127"></a>
<span class="sourceLineNo">128</span>            throw new IllegalArgumentException("null startType");<a name="line.128"></a>
<span class="sourceLineNo">129</span>        if (path == null)<a name="line.129"></a>
<span class="sourceLineNo">130</span>            throw new IllegalArgumentException("null path");<a name="line.130"></a>
<span class="sourceLineNo">131</span>        final String errorPrefix = "invalid path `" + path + "': ";<a name="line.131"></a>
<span class="sourceLineNo">132</span>        if (path.length() == 0)<a name="line.132"></a>
<span class="sourceLineNo">133</span>            throw new IllegalArgumentException(errorPrefix + "path is empty");<a name="line.133"></a>
<span class="sourceLineNo">134</span>        this.startType = startType;<a name="line.134"></a>
<span class="sourceLineNo">135</span>        this.path = path;<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>        // Split the path into field names<a name="line.137"></a>
<span class="sourceLineNo">138</span>        final ArrayDeque&lt;String&gt; fieldNames = new ArrayDeque&lt;&gt;();<a name="line.138"></a>
<span class="sourceLineNo">139</span>        while (true) {<a name="line.139"></a>
<span class="sourceLineNo">140</span>            final int dot = path.indexOf('.');<a name="line.140"></a>
<span class="sourceLineNo">141</span>            if (dot == -1) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>                if (path.length() == 0)<a name="line.142"></a>
<span class="sourceLineNo">143</span>                    throw new IllegalArgumentException(errorPrefix + "ends in `.'");<a name="line.143"></a>
<span class="sourceLineNo">144</span>                fieldNames.add(path);<a name="line.144"></a>
<span class="sourceLineNo">145</span>                break;<a name="line.145"></a>
<span class="sourceLineNo">146</span>            }<a name="line.146"></a>
<span class="sourceLineNo">147</span>            if (dot == 0)<a name="line.147"></a>
<span class="sourceLineNo">148</span>                throw new IllegalArgumentException(errorPrefix + "contains an empty path component");<a name="line.148"></a>
<span class="sourceLineNo">149</span>            fieldNames.add(path.substring(0, dot));<a name="line.149"></a>
<span class="sourceLineNo">150</span>            path = path.substring(dot + 1);<a name="line.150"></a>
<span class="sourceLineNo">151</span>        }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>        // Initialize loop state<a name="line.153"></a>
<span class="sourceLineNo">154</span>        Class&lt;?&gt; currentType = this.startType;<a name="line.154"></a>
<span class="sourceLineNo">155</span>        JFieldInfo fieldInfo = null;<a name="line.155"></a>
<span class="sourceLineNo">156</span>        JComplexFieldInfo superFieldInfo = null;<a name="line.156"></a>
<span class="sourceLineNo">157</span>        if (this.log.isTraceEnabled()) {<a name="line.157"></a>
<span class="sourceLineNo">158</span>            this.log.trace("RefPath: START: startType=" + this.startType + " path=" + fieldNames<a name="line.158"></a>
<span class="sourceLineNo">159</span>              + " lastIsSubField=" + lastIsSubField);<a name="line.159"></a>
<span class="sourceLineNo">160</span>        }<a name="line.160"></a>
<span class="sourceLineNo">161</span><a name="line.161"></a>
<span class="sourceLineNo">162</span>        // Parse field names<a name="line.162"></a>
<span class="sourceLineNo">163</span>        final ArrayList&lt;Integer&gt; storageIds = new ArrayList&lt;&gt;();<a name="line.163"></a>
<span class="sourceLineNo">164</span>        assert !fieldNames.isEmpty();<a name="line.164"></a>
<span class="sourceLineNo">165</span>        while (!fieldNames.isEmpty()) {<a name="line.165"></a>
<span class="sourceLineNo">166</span>            final String fieldName = fieldNames.removeFirst();<a name="line.166"></a>
<span class="sourceLineNo">167</span>            String description = "field `" + fieldName + "' in type " + currentType;<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span>            // Get explicit storage ID, if any<a name="line.169"></a>
<span class="sourceLineNo">170</span>            final int hash = fieldName.indexOf('#');<a name="line.170"></a>
<span class="sourceLineNo">171</span>            int explicitStorageId = 0;<a name="line.171"></a>
<span class="sourceLineNo">172</span>            final String searchName;<a name="line.172"></a>
<span class="sourceLineNo">173</span>            if (hash != -1) {<a name="line.173"></a>
<span class="sourceLineNo">174</span>                try {<a name="line.174"></a>
<span class="sourceLineNo">175</span>                    explicitStorageId = Integer.parseInt(fieldName.substring(hash + 1));<a name="line.175"></a>
<span class="sourceLineNo">176</span>                } catch (NumberFormatException e) {<a name="line.176"></a>
<span class="sourceLineNo">177</span>                    throw new IllegalArgumentException(errorPrefix + "invalid field name `" + fieldName + "'");<a name="line.177"></a>
<span class="sourceLineNo">178</span>                }<a name="line.178"></a>
<span class="sourceLineNo">179</span>                searchName = fieldName.substring(0, hash);<a name="line.179"></a>
<span class="sourceLineNo">180</span>            } else<a name="line.180"></a>
<span class="sourceLineNo">181</span>                searchName = fieldName;<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span>            // Logging<a name="line.183"></a>
<span class="sourceLineNo">184</span>            if (this.log.isTraceEnabled())<a name="line.184"></a>
<span class="sourceLineNo">185</span>                this.log.trace("RefPath: [" + searchName + "] currentType=" + currentType + " storageId=" + explicitStorageId);<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>            // Find all JFields matching 'fieldName' in some JClass whose type matches 'typeToken'<a name="line.187"></a>
<span class="sourceLineNo">188</span>            final HashMap&lt;JClass&lt;?&gt;, JField&gt; matchingFields = new HashMap&lt;&gt;();<a name="line.188"></a>
<span class="sourceLineNo">189</span>            for (JClass&lt;?&gt; jclass : jdb.jclasses.values()) {<a name="line.189"></a>
<span class="sourceLineNo">190</span>                if (!currentType.isAssignableFrom(jclass.type))<a name="line.190"></a>
<span class="sourceLineNo">191</span>                    continue;<a name="line.191"></a>
<span class="sourceLineNo">192</span>                final JField jfield = jclass.jfieldsByName.get(searchName);<a name="line.192"></a>
<span class="sourceLineNo">193</span>                if (jfield == null)<a name="line.193"></a>
<span class="sourceLineNo">194</span>                    continue;<a name="line.194"></a>
<span class="sourceLineNo">195</span>                if (explicitStorageId != 0 &amp;&amp; jfield.storageId != explicitStorageId)<a name="line.195"></a>
<span class="sourceLineNo">196</span>                    continue;<a name="line.196"></a>
<span class="sourceLineNo">197</span>                matchingFields.put(jclass, jfield);<a name="line.197"></a>
<span class="sourceLineNo">198</span>            }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span>            // Logging<a name="line.200"></a>
<span class="sourceLineNo">201</span>            if (this.log.isTraceEnabled())<a name="line.201"></a>
<span class="sourceLineNo">202</span>                this.log.trace("RefPath: matching fields: " + matchingFields);<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>            // Check matching fields and verify they all have the same storage ID<a name="line.204"></a>
<span class="sourceLineNo">205</span>            if (matchingFields.isEmpty()) {<a name="line.205"></a>
<span class="sourceLineNo">206</span>                throw new IllegalArgumentException(errorPrefix + "there is no field named `" + searchName + "'"<a name="line.206"></a>
<span class="sourceLineNo">207</span>                  + (explicitStorageId != 0 ? " with storage ID " + explicitStorageId : "")<a name="line.207"></a>
<span class="sourceLineNo">208</span>                  + " in (any sub-type of) " + currentType);<a name="line.208"></a>
<span class="sourceLineNo">209</span>            }<a name="line.209"></a>
<span class="sourceLineNo">210</span>            final int fieldStorageId = matchingFields.values().iterator().next().storageId;<a name="line.210"></a>
<span class="sourceLineNo">211</span>            for (JField jfield : matchingFields.values()) {<a name="line.211"></a>
<span class="sourceLineNo">212</span>                if (jfield.storageId != fieldStorageId) {<a name="line.212"></a>
<span class="sourceLineNo">213</span>                    throw new IllegalArgumentException(errorPrefix + "there are multiple, non-equal fields named `"<a name="line.213"></a>
<span class="sourceLineNo">214</span>                      + fieldName + "' in sub-types of type " + currentType);<a name="line.214"></a>
<span class="sourceLineNo">215</span>                }<a name="line.215"></a>
<span class="sourceLineNo">216</span>            }<a name="line.216"></a>
<span class="sourceLineNo">217</span>            fieldInfo = jdb.getJFieldInfo(fieldStorageId, JFieldInfo.class);<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>            // Get common supertype of all types containing the field<a name="line.219"></a>
<span class="sourceLineNo">220</span>            currentType = Util.findLowestCommonAncestorOfClasses(<a name="line.220"></a>
<span class="sourceLineNo">221</span>              Iterables.transform(matchingFields.keySet(), new JClassTypeFunction())).getRawType();<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>            // Logging<a name="line.223"></a>
<span class="sourceLineNo">224</span>            if (this.log.isTraceEnabled())<a name="line.224"></a>
<span class="sourceLineNo">225</span>                this.log.trace("RefPath: updated currentType=" + currentType + " fieldType=" + fieldInfo.getTypeToken(currentType));<a name="line.225"></a>
<span class="sourceLineNo">226</span><a name="line.226"></a>
<span class="sourceLineNo">227</span>            // Handle complex fields<a name="line.227"></a>
<span class="sourceLineNo">228</span>            superFieldInfo = null;<a name="line.228"></a>
<span class="sourceLineNo">229</span>            if (fieldInfo instanceof JComplexFieldInfo) {<a name="line.229"></a>
<span class="sourceLineNo">230</span>                final JComplexFieldInfo complexFieldInfo = (JComplexFieldInfo)fieldInfo;<a name="line.230"></a>
<span class="sourceLineNo">231</span><a name="line.231"></a>
<span class="sourceLineNo">232</span>                // Last field?<a name="line.232"></a>
<span class="sourceLineNo">233</span>                if (fieldNames.isEmpty()) {<a name="line.233"></a>
<span class="sourceLineNo">234</span>                    if (lastIsSubField != null &amp;&amp; lastIsSubField) {<a name="line.234"></a>
<span class="sourceLineNo">235</span>                        throw new IllegalArgumentException(errorPrefix + "path may not end on complex " + description<a name="line.235"></a>
<span class="sourceLineNo">236</span>                          + "; a sub-field of must be specified");<a name="line.236"></a>
<span class="sourceLineNo">237</span>                    }<a name="line.237"></a>
<span class="sourceLineNo">238</span>                    break;<a name="line.238"></a>
<span class="sourceLineNo">239</span>                }<a name="line.239"></a>
<span class="sourceLineNo">240</span>                superFieldInfo = complexFieldInfo;<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>                // Get sub-field<a name="line.242"></a>
<span class="sourceLineNo">243</span>                final String subFieldName = fieldNames.removeFirst();<a name="line.243"></a>
<span class="sourceLineNo">244</span>                description = "sub-field `" + subFieldName + "' of complex " + description;<a name="line.244"></a>
<span class="sourceLineNo">245</span>                try {<a name="line.245"></a>
<span class="sourceLineNo">246</span>                    fieldInfo = complexFieldInfo.getSubFieldInfo(subFieldName);<a name="line.246"></a>
<span class="sourceLineNo">247</span>                } catch (IllegalArgumentException e) {<a name="line.247"></a>
<span class="sourceLineNo">248</span>                    throw new IllegalArgumentException(errorPrefix + "invalid " + description + ": " + e.getMessage(), e);<a name="line.248"></a>
<span class="sourceLineNo">249</span>                }<a name="line.249"></a>
<span class="sourceLineNo">250</span><a name="line.250"></a>
<span class="sourceLineNo">251</span>                // Update matching fields to match sub-field<a name="line.251"></a>
<span class="sourceLineNo">252</span>                for (Map.Entry&lt;JClass&lt;?&gt;, JField&gt; entry : matchingFields.entrySet())<a name="line.252"></a>
<span class="sourceLineNo">253</span>                    entry.setValue(((JComplexField)entry.getValue()).getSubField(subFieldName));<a name="line.253"></a>
<span class="sourceLineNo">254</span><a name="line.254"></a>
<span class="sourceLineNo">255</span>                // Logging<a name="line.255"></a>
<span class="sourceLineNo">256</span>                if (this.log.isTraceEnabled())<a name="line.256"></a>
<span class="sourceLineNo">257</span>                    this.log.trace("RefPath: [" + searchName + "." + subFieldName + "] new matching fields=" + matchingFields);<a name="line.257"></a>
<span class="sourceLineNo">258</span>            }<a name="line.258"></a>
<span class="sourceLineNo">259</span><a name="line.259"></a>
<span class="sourceLineNo">260</span>            // Last field?<a name="line.260"></a>
<span class="sourceLineNo">261</span>            if (fieldNames.isEmpty()) {<a name="line.261"></a>
<span class="sourceLineNo">262</span>                if (superFieldInfo != null &amp;&amp; Boolean.FALSE.equals(lastIsSubField)) {<a name="line.262"></a>
<span class="sourceLineNo">263</span>                    throw new IllegalArgumentException(errorPrefix + "path may not end on " + description<a name="line.263"></a>
<span class="sourceLineNo">264</span>                      + "; specify the complex field itself instead");<a name="line.264"></a>
<span class="sourceLineNo">265</span>                }<a name="line.265"></a>
<span class="sourceLineNo">266</span>                break;<a name="line.266"></a>
<span class="sourceLineNo">267</span>            }<a name="line.267"></a>
<span class="sourceLineNo">268</span><a name="line.268"></a>
<span class="sourceLineNo">269</span>            // Field is not last, so it must be a reference field<a name="line.269"></a>
<span class="sourceLineNo">270</span>            if (!(fieldInfo instanceof JReferenceFieldInfo))<a name="line.270"></a>
<span class="sourceLineNo">271</span>                throw new IllegalArgumentException(errorPrefix + description + " is not a reference field");<a name="line.271"></a>
<span class="sourceLineNo">272</span>            final JReferenceFieldInfo referenceFieldInfo = (JReferenceFieldInfo)fieldInfo;<a name="line.272"></a>
<span class="sourceLineNo">273</span><a name="line.273"></a>
<span class="sourceLineNo">274</span>            // Add reference field to the reference field list<a name="line.274"></a>
<span class="sourceLineNo">275</span>            this.referenceFieldInfos.add(referenceFieldInfo);<a name="line.275"></a>
<span class="sourceLineNo">276</span><a name="line.276"></a>
<span class="sourceLineNo">277</span>            // Advance through the reference, using the narrowest type possible<a name="line.277"></a>
<span class="sourceLineNo">278</span>            currentType = Util.findLowestCommonAncestor(Iterables.transform(<a name="line.278"></a>
<span class="sourceLineNo">279</span>               Iterables.transform(matchingFields.values(), new CastFunction&lt;JReferenceField&gt;(JReferenceField.class)),<a name="line.279"></a>
<span class="sourceLineNo">280</span>              new JReferenceFieldTypeFunction())).getRawType();<a name="line.280"></a>
<span class="sourceLineNo">281</span><a name="line.281"></a>
<span class="sourceLineNo">282</span>            // Logging<a name="line.282"></a>
<span class="sourceLineNo">283</span>            if (this.log.isTraceEnabled())<a name="line.283"></a>
<span class="sourceLineNo">284</span>                this.log.trace("RefPath: step through reference, new currentType=" + currentType);<a name="line.284"></a>
<span class="sourceLineNo">285</span>        }<a name="line.285"></a>
<span class="sourceLineNo">286</span><a name="line.286"></a>
<span class="sourceLineNo">287</span>        // Done<a name="line.287"></a>
<span class="sourceLineNo">288</span>        this.targetType = currentType;<a name="line.288"></a>
<span class="sourceLineNo">289</span>        this.targetFieldInfo = fieldInfo;<a name="line.289"></a>
<span class="sourceLineNo">290</span>        this.targetSuperFieldInfo = superFieldInfo;<a name="line.290"></a>
<span class="sourceLineNo">291</span><a name="line.291"></a>
<span class="sourceLineNo">292</span>        // Logging<a name="line.292"></a>
<span class="sourceLineNo">293</span>        if (this.log.isTraceEnabled()) {<a name="line.293"></a>
<span class="sourceLineNo">294</span>            this.log.trace("RefPath: DONE: targetType=" + this.targetType + " targetFieldInfo=" + this.targetFieldInfo<a name="line.294"></a>
<span class="sourceLineNo">295</span>              + " targetSuperFieldInfo=" + this.targetSuperFieldInfo + " targetFieldType=" + this.getTargetFieldType()<a name="line.295"></a>
<span class="sourceLineNo">296</span>              + " references=" + this.referenceFieldInfos);<a name="line.296"></a>
<span class="sourceLineNo">297</span>        }<a name="line.297"></a>
<span class="sourceLineNo">298</span>    }<a name="line.298"></a>
<span class="sourceLineNo">299</span><a name="line.299"></a>
<span class="sourceLineNo">300</span>    /**<a name="line.300"></a>
<span class="sourceLineNo">301</span>     * Get the Java type of the object at which this path starts.<a name="line.301"></a>
<span class="sourceLineNo">302</span>     *<a name="line.302"></a>
<span class="sourceLineNo">303</span>     * &lt;p&gt;<a name="line.303"></a>
<span class="sourceLineNo">304</span>     * If there are zero {@linkplain #getReferenceFields reference fields} in this path, then this will<a name="line.304"></a>
<span class="sourceLineNo">305</span>     * equal the {@linkplain #getTargetType target object type}, or possibly a super-type if the target<a name="line.305"></a>
<span class="sourceLineNo">306</span>     * field exists only in a sub-type.<a name="line.306"></a>
<span class="sourceLineNo">307</span>     * &lt;/p&gt;<a name="line.307"></a>
<span class="sourceLineNo">308</span>     *<a name="line.308"></a>
<span class="sourceLineNo">309</span>     * @return the Java type at which this reference path starts<a name="line.309"></a>
<span class="sourceLineNo">310</span>     */<a name="line.310"></a>
<span class="sourceLineNo">311</span>    public Class&lt;?&gt; getStartType() {<a name="line.311"></a>
<span class="sourceLineNo">312</span>        return this.startType;<a name="line.312"></a>
<span class="sourceLineNo">313</span>    }<a name="line.313"></a>
<span class="sourceLineNo">314</span><a name="line.314"></a>
<span class="sourceLineNo">315</span>    /**<a name="line.315"></a>
<span class="sourceLineNo">316</span>     * Get the Java type of the object at which this path ends.<a name="line.316"></a>
<span class="sourceLineNo">317</span>     *<a name="line.317"></a>
<span class="sourceLineNo">318</span>     * &lt;p&gt;<a name="line.318"></a>
<span class="sourceLineNo">319</span>     * If there are zero {@linkplain #getReferenceFields reference fields} in this path, then this will<a name="line.319"></a>
<span class="sourceLineNo">320</span>     * equal the Java type of the {@linkplain #getStartType starting object type}, or possibly a sub-type<a name="line.320"></a>
<span class="sourceLineNo">321</span>     * if the target field exists only in a sub-type.<a name="line.321"></a>
<span class="sourceLineNo">322</span>     * &lt;/p&gt;<a name="line.322"></a>
<span class="sourceLineNo">323</span>     *<a name="line.323"></a>
<span class="sourceLineNo">324</span>     * @return the Java type at which this reference path ends<a name="line.324"></a>
<span class="sourceLineNo">325</span>     */<a name="line.325"></a>
<span class="sourceLineNo">326</span>    public Class&lt;?&gt; getTargetType() {<a name="line.326"></a>
<span class="sourceLineNo">327</span>        return this.targetType;<a name="line.327"></a>
<span class="sourceLineNo">328</span>    }<a name="line.328"></a>
<span class="sourceLineNo">329</span><a name="line.329"></a>
<span class="sourceLineNo">330</span>    /**<a name="line.330"></a>
<span class="sourceLineNo">331</span>     * Get the Java type corresponding to the field at which this path ends.<a name="line.331"></a>
<span class="sourceLineNo">332</span>     *<a name="line.332"></a>
<span class="sourceLineNo">333</span>     * @return the type of the field at which this reference path ends<a name="line.333"></a>
<span class="sourceLineNo">334</span>     */<a name="line.334"></a>
<span class="sourceLineNo">335</span>    public TypeToken&lt;?&gt; getTargetFieldType() {<a name="line.335"></a>
<span class="sourceLineNo">336</span>        return this.targetFieldInfo.getTypeToken(this.targetType);<a name="line.336"></a>
<span class="sourceLineNo">337</span>    }<a name="line.337"></a>
<span class="sourceLineNo">338</span><a name="line.338"></a>
<span class="sourceLineNo">339</span>    /**<a name="line.339"></a>
<span class="sourceLineNo">340</span>     * Get the storage ID associated with the target field in the {@linkplain #getTargetType target object type}.<a name="line.340"></a>
<span class="sourceLineNo">341</span>     *<a name="line.341"></a>
<span class="sourceLineNo">342</span>     * &lt;p&gt;<a name="line.342"></a>
<span class="sourceLineNo">343</span>     * This is just the storage ID of the last field in the path.<a name="line.343"></a>
<span class="sourceLineNo">344</span>     * &lt;/p&gt;<a name="line.344"></a>
<span class="sourceLineNo">345</span>     *<a name="line.345"></a>
<span class="sourceLineNo">346</span>     * @return the storage ID of the field at which this reference path ends<a name="line.346"></a>
<span class="sourceLineNo">347</span>     */<a name="line.347"></a>
<span class="sourceLineNo">348</span>    public int getTargetField() {<a name="line.348"></a>
<span class="sourceLineNo">349</span>        return this.targetFieldInfo.storageId;<a name="line.349"></a>
<span class="sourceLineNo">350</span>    }<a name="line.350"></a>
<span class="sourceLineNo">351</span><a name="line.351"></a>
<span class="sourceLineNo">352</span>    /**<a name="line.352"></a>
<span class="sourceLineNo">353</span>     * Get the storage ID associated with the complex field containing the {@linkplain #getTargetField target field}<a name="line.353"></a>
<span class="sourceLineNo">354</span>     * a sub-field, in the case that the target field is a sub-field of a complex field.<a name="line.354"></a>
<span class="sourceLineNo">355</span>     *<a name="line.355"></a>
<span class="sourceLineNo">356</span>     * @return target field's complex super-field storage ID, or zero if the target field is not a complex sub-field<a name="line.356"></a>
<span class="sourceLineNo">357</span>     */<a name="line.357"></a>
<span class="sourceLineNo">358</span>    public int getTargetSuperField() {<a name="line.358"></a>
<span class="sourceLineNo">359</span>        return this.targetSuperFieldInfo != null ? this.targetSuperFieldInfo.storageId : 0;<a name="line.359"></a>
<span class="sourceLineNo">360</span>    }<a name="line.360"></a>
<span class="sourceLineNo">361</span><a name="line.361"></a>
<span class="sourceLineNo">362</span>    /**<a name="line.362"></a>
<span class="sourceLineNo">363</span>     * Get the storage IDs of the reference fields in this path.<a name="line.363"></a>
<span class="sourceLineNo">364</span>     *<a name="line.364"></a>
<span class="sourceLineNo">365</span>     * &lt;p&gt;<a name="line.365"></a>
<span class="sourceLineNo">366</span>     * The path may be empty, i.e., zero references are traversed in the path.<a name="line.366"></a>
<span class="sourceLineNo">367</span>     * &lt;/p&gt;<a name="line.367"></a>
<span class="sourceLineNo">368</span>     *<a name="line.368"></a>
<span class="sourceLineNo">369</span>     * &lt;p&gt;<a name="line.369"></a>
<span class="sourceLineNo">370</span>     * Otherwise, the first field is a field in the {@linkplain #getStartType starting object type} and<a name="line.370"></a>
<span class="sourceLineNo">371</span>     * the last field is field in some object type that refers to the {@linkplain #getTargetType target object type}.<a name="line.371"></a>
<span class="sourceLineNo">372</span>     * &lt;/p&gt;<a name="line.372"></a>
<span class="sourceLineNo">373</span>     *<a name="line.373"></a>
<span class="sourceLineNo">374</span>     * @return zero or more reference field storage IDs<a name="line.374"></a>
<span class="sourceLineNo">375</span>     */<a name="line.375"></a>
<span class="sourceLineNo">376</span>    public int[] getReferenceFields() {<a name="line.376"></a>
<span class="sourceLineNo">377</span>        final int[] storageIds = new int[this.referenceFieldInfos.size()];<a name="line.377"></a>
<span class="sourceLineNo">378</span>        for (int i = 0; i &lt; storageIds.length; i++)<a name="line.378"></a>
<span class="sourceLineNo">379</span>            storageIds[i] = this.referenceFieldInfos.get(i).storageId;<a name="line.379"></a>
<span class="sourceLineNo">380</span>        return storageIds;<a name="line.380"></a>
<span class="sourceLineNo">381</span>    }<a name="line.381"></a>
<span class="sourceLineNo">382</span><a name="line.382"></a>
<span class="sourceLineNo">383</span>    /**<a name="line.383"></a>
<span class="sourceLineNo">384</span>     * Get the {@link String} form of the path associated with this instance.<a name="line.384"></a>
<span class="sourceLineNo">385</span>     */<a name="line.385"></a>
<span class="sourceLineNo">386</span>    @Override<a name="line.386"></a>
<span class="sourceLineNo">387</span>    public String toString() {<a name="line.387"></a>
<span class="sourceLineNo">388</span>        return this.path;<a name="line.388"></a>
<span class="sourceLineNo">389</span>    }<a name="line.389"></a>
<span class="sourceLineNo">390</span><a name="line.390"></a>
<span class="sourceLineNo">391</span>// Functions<a name="line.391"></a>
<span class="sourceLineNo">392</span><a name="line.392"></a>
<span class="sourceLineNo">393</span>    private static class JReferenceFieldTypeFunction implements Function&lt;JReferenceField, TypeToken&lt;?&gt;&gt; {<a name="line.393"></a>
<span class="sourceLineNo">394</span><a name="line.394"></a>
<span class="sourceLineNo">395</span>        @Override<a name="line.395"></a>
<span class="sourceLineNo">396</span>        public TypeToken&lt;?&gt; apply(JReferenceField jfield) {<a name="line.396"></a>
<span class="sourceLineNo">397</span>            return jfield.typeToken;<a name="line.397"></a>
<span class="sourceLineNo">398</span>        }<a name="line.398"></a>
<span class="sourceLineNo">399</span>    }<a name="line.399"></a>
<span class="sourceLineNo">400</span><a name="line.400"></a>
<span class="sourceLineNo">401</span>    private static class JClassTypeFunction implements Function&lt;JClass&lt;?&gt;, Class&lt;?&gt;&gt; {<a name="line.401"></a>
<span class="sourceLineNo">402</span><a name="line.402"></a>
<span class="sourceLineNo">403</span>        @Override<a name="line.403"></a>
<span class="sourceLineNo">404</span>        public Class&lt;?&gt; apply(JClass&lt;?&gt; jclass) {<a name="line.404"></a>
<span class="sourceLineNo">405</span>            return jclass.type;<a name="line.405"></a>
<span class="sourceLineNo">406</span>        }<a name="line.406"></a>
<span class="sourceLineNo">407</span>    }<a name="line.407"></a>
<span class="sourceLineNo">408</span>}<a name="line.408"></a>
<span class="sourceLineNo">409</span><a name="line.409"></a>




























































</pre>
</div>
</body>
</html>
